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The seizure of government buildings by armed men in Ukraine's Crimea region could lead to a regional conflict, the Polish foreign minister has said.

Polish foreign minister Radoslaw Sikorski was one of three EU ministers to mediate Ukrainian talks last week. Credit: PA

Radoslaw Sikorski said the move was "a drastic step and I'm warning those who did this and those who allowed them to do this, because this is how regional conflicts begin. This is a very dangerous game."

The German defence minister has also expressed concerns over the events on the Crimea peninsula, saying the breakup of Ukraine must be avoided.

Countries in Eastern Europe have issued their support for Ukraine, after new parliamentary speaker Oleksander Turchinov, an ally of former prime minister Yulia Tymoshenko, was granted presidential powers: